Application of non-destructive and sequential analyses of chemical composition using by scanning X-ray analytical microscope (SXAM): A case study of Lake Inawashiro-ko sediment core

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  • 走査型X線分析顕微鏡（SXAM）による非破壊・連続化学組成分析の猪苗代湖湖底堆積物コアへの適用
  • ソウサガタ Xセン ブンセキ ケンビキョウ(SXAM)ニ ヨル ヒハカイ ・ レンゾク カガク ソセイ ブンセキ ノ イナワシロコ コテイ タイセキブツ コア エ ノ テキヨウ

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<p>Measured values of twelve elements analyzed by scanning X-ray analytical microscope (SXAM) have been evaluated by comparing them with that of conventional X-ray fluorescence spec-trometry analysis (XRF). The samples used were powder-pressed pellets of the GSJ (Geological Survey of Japan) geochemical reference samples and Lake Inawashiro-ko lacustrine sediments. The chemical compositions obtained by the SXAM were quantified by fundamental parameter (FP) method with one standard spectrum. The measured values of titanium, aluminum, iron, manganese and potassium by the SXAM are consistent with a recommended value of the GSJ geochemical reference samples, and fulfill a level comparable to that of the XRF FP-method analysis. The quantifications of silicon, magnesium, calcium and sulfur have a systematic deviation from the recommended values of the GSJ geochemical reference samples, however each element indicates good linear regression relations based on the least squares method. Data of arsenic show relatively low regression relations, however, the values can be used semi-quantitatively only for samples which have low values of lead, such as sediments in Lake Inawashiro-ko. The quantifications of sodium and phosphorus could not be obtained using this method. As a worked example, the non-destructive and sequential SXAM analyses of lacustrine sediments in Lake Inawashiro-ko were performed. Eleven peaks of manganese, iron and sulfur from IN2.5-11 core sample and twelve peaks of iron from IN2.5-11 core sample were identified from the profiles of individual elements. Consequently, these peaks of iron and sulfur profiles can be correlated to the horizons of dark clay layers.</p>

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